Improved lathe attachment for finishing dental plates



to be used as a rest.

UNITED STATES PATENT OFFICE..

IMPROVED LATHE ATTACHMENT FOR FINISHING DENTAL PLATES.

Specification forming part of ietters Patent No. 29,548, dated January11,1859.

To all whom it may concern:

Be it known that I, ELIJAH H. DANEoe'rH,

of Jamestown, in the county of Chautauquav and State of New York, haveinvented a new and useful Machine for Filing, Scraping, Stoning, andBurnishing all Dental Plates; and I do hereby' declare that thefollowing is a full, clear, and exact description ofthe construction andoperation of the same, reference being had to the an neXed drawing,making a part of this specification, the figure being a perspective viewot' the lathe attachment compound dental finisher.

It consists of two bed-pieces, c a, two and one-half inches long andonehalf of an inch wide and one-fourth oi' an inch in thickness. Thesebed-pieces lie parallel with each other about one-halt inch apart. Tothem are attached two boxes, b b, which are one-fourth of an inch inthickness, and wide enough to extend across both bed-pieces,includingthe slide which supports the rest. These boxes receive and carry thepiston c c, which is onehalf inch in diameter and round, except at theend d, which islive-eighths of an inch square in diameter andseven-eighths of an inch in length. In the end d ofthe piston is an openmortise one-half inch deep, of sufiicient capacity to receive a file orother tool three-sixteenths of an inch in thickness or more, ifdesirable. ton is a thumbfscrew, to hold the tile or'other tool firmlyin its place'. Under the end d is a block ofsteel or other metal in theform of a T, three-fourths of an inch long, attached to the ends of thebed-pieces to prevent the piston from rolling. Under the boxes b b andbetween the bed-pieces a a is a slide, e e, four inches in length, ofthe same thickness as the bed-pieces, and wide enough to lill the spacebetween them. Upon the upper side ot' the endf of this slide is placed ablock, g, whose upper sidelacks one-sixteenth inch of reaching a linedrawn parallel with and upon the lower inner surface of the openmortise, said block This slide is held in place by a thumb-screw, h;also, an adjustable cranlgwhich consists of a block of brass or In theupperside of end d ot' the pisother metal, t', about three-fourths of aninch long and one-half inch in diameter,which may be round oroctangular. In one end of this is a hole to receive the mandrel or chuckof a lathe. In the other end is a dovetailed groove, to :receive aslide, j, which is one inch long and three-eighths of an inch indiameter, in one end of which is a pin standing at right angles with theslide j, and is one-fourth of an l inch long and one-fourth of an inchin diameter. This slide is held in its place by a screw, k, and by meansof it the movement of the slide j is adjusted and xed, so thatthe'piston shall have any desired motion.

. It further consists of a connection, ZZ, two inches long andone-fourth of an inch in diameter, which is connected with the piston cc at the end m by ajoint, while the other end is carried by the pin inthe slide j and secured by the screw a.

To use this machine, adjust it so that the pistonl and connection areparallel with each other and at right angles with the mandrel of alathe. A block should be used for this adjust-ing, to which the machinemay be pernia4 nently attached, which block may be attached to the bedof the lathe, as most convenient, by screw or otherwise. A screw-threadmay be cut in the block ofthe crank, to tit the lathe, and thus beattached. Then insert a tile or other tool in the open mortise; holdyour work againstthe rest and also against the under side ofthe tile orother tool used.

What I claim as my invention, and desire to secure by Letters Patent,is-

l. The combination ot' the mechanical devices herein speciiied,consisting of the piston c c, bed-pieces a a, boxes b b, slides e e andj, and the crank, constructed and operated for den tal and otherpurposes, as herein described.

2. The adjustable crank as it is arranged and attached to the specifiedparts of this Inachine, as herein set forth.

E. H. DNEOETH.

Vitnesses:

C. R. LooKWooD, JAMES M. BROWN.

